DS1543WP-120,实时时钟
DS1543WP-120+,实时时钟
DS1543WP-150,实时时钟
DS1543WP-150+,实时时钟
DS1543WP-200,实时时钟
DS1553-100,IC RTC RAM Y2K 5V 100NS 28-EDIP
DS1553-100+,IC RTC RAM Y2K 5V 100NS 28-EDIP
DS1553-70,IC RTC RAM Y2K 5V 70NS 28-EDIP
